How to solve this dynamics problem with two masses and friction

[coltin.walsh]

Dynamics Problem Help Needed!

Homework Statement

K. So i have no idea how to even start this problem. can someone please explain how step by step? Thanks a million!

http://www.flickr.com/photos/55153239@N03/6247406013/

Homework Equations

The Attempt at a Solution

I have no idea where to even start. Please help..

 

[NascentOxygen]

Draw a large diagram, and mark on what you are given. I think you should start by examining the stationary situation, by setting P=0, and determining whether the slider will move when its brake is released. In this scenario, the only force acting to move it is its own weight, though opposed by static friction.

By working through it this way, you will probably recognize how to later involve the accelerating force P.

 

[Desh627]

Agreed. I had lots of trouble in dynamics until I learned that the easiest way to solve just about any problem was to calm down and then draw FBDs, marking the givens and unknowns. After that, it almost always becomes a matter of simple mechanics.